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Method for producing large aperture thick wall tube stock

A production method and technology of thick-walled tubes, applied in mechanical equipment, engine components, etc., can solve the problems of thin tube walls, uneven tissue distribution, small tube diameter, etc., and achieve the effect of good tissue distribution

Active Publication Date: 2015-05-20
PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the problems that most of the pipes produced by the existing pipe production methods have thinner pipe walls and smaller pipe diameters, and the problems of uneven tissue distribution and coarse grain size, and provide a production method for large-diameter thick-walled pipes

Method used

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  • Method for producing large aperture thick wall tube stock
  • Method for producing large aperture thick wall tube stock

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041]This embodiment is used to illustrate the production method of the large-diameter thick-walled pipe provided by the present invention

[0042] Put a steel ingot with a diameter of 550mm and a length of 1000mm into a bell-type heating furnace for heating, control the parameters of the bell-type heating furnace so that the temperature of the steel ingot is controlled at 1150°C, and then use a 4500KN fast forging machine to heat the heated steel ingot. Second upsetting, control the upsetting of the steel ingot after the first upsetting to 1 / 2 of the length of the ingot body, the steel ingot after the second upsetting upsetting to 1 / 3 of the length of the ingot body, and then carry out punching, reaming and multi-fire The heating temperature of the last two fires in the multi-fire and secondary drawing process is controlled to be 1050 ° C, and then air-cooled to room temperature, and then solid solution is carried out, the solid solution temperature is 940 ° C, and the holdin...

Embodiment 2

[0047] This embodiment is used to illustrate the production method of the large-diameter thick-walled pipe provided by the present invention

[0048] Put a steel ingot with a diameter of 1000mm and a length of 3000mm into a bell-type heating furnace for heating, control the parameters of the bell-type heating furnace so that the temperature of the steel ingot is controlled at 1200 ° C, and then use a 4500KN fast forging machine to heat the heated steel ingot. Second upsetting, control the upsetting of the steel ingot after the first upsetting to 1 / 3 of the length of the ingot body, the steel ingot after the second upsetting is upsetting to 1 / 3 of the length of the ingot body, and then carry out punching, reaming and multi-fire The heating temperature of the last two fires in the multi-fire and secondary drawing process is controlled to be 1100 ° C, and then air-cooled to room temperature, and then solid solution is carried out. The holding temperature of the solid solution proc...

Embodiment 3

[0054] This embodiment is used to illustrate the production method of the large-diameter thick-walled pipe provided by the present invention

[0055] Put a steel ingot with a diameter of 760 mm and a length of 2300 mm into a bell-type heating furnace for heating, control the parameters of the bell-type heating furnace so that the temperature of the steel ingot is controlled at 1170 °C, and then use a 4500KN fast forging machine to heat the heated steel ingot. Second upsetting, control the upsetting of the steel ingot after the first upsetting to 1 / 2 of the length of the ingot body, the steel ingot after the second upsetting is upsetting to 1 / 3 of the length of the ingot body, and then carry out punching, reaming and multi-fire The heating temperature of the last two fires in the multi-fire and secondary drawing process is controlled to be 1050 ° C, and then air-cooled to room temperature, and then solid solution is carried out, the solid solution temperature is 945 ° C, and the...

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Abstract

The invention provides a method for producing a large aperture thick wall tube stock. The method comprises the steps that 1, a first forging process: a steel ingot of a nickel alloy is heated, and the upsetting, punching, chambering, multiple heating number drawing and cooling are conducted on the heated steel ingot in sequence, and then a fat tube blank is obtained by a solid solution, wherein in the process of the multiple heating number drawing, the temperatures of last two heating processes are 1000-1150 DEG C; 2, a second forging process: the heating, forging, air cooling and the solid solution are conducted on the fat tube blank in sequence, wherein the deformation temperature of the fat tube blank in the forging process is 500-800 DEG C. By the adoption of the producing method, the obtained tube stock has a better organization distribution, the grain size degree can reach more than forth grade, the external diameter can reach more than 750 mm, and the thickness of a wall can reach more than 40 mm.

Description

technical field [0001] The invention relates to a production method of a large-diameter thick-walled pipe. Background technique [0002] Currently, titanium-stabilized fully austenitic nickel-iron-chromium alloys are commercially available as Incoloy 825 (also known as UNS N08825, NS1402, Nicrofer 4221, and Sanicro 41), which also has copper and molybdenum added. Incoloy 825 is a general purpose engineering alloy, the high nickel content gives it effective resistance to stress corrosion cracking, good corrosion resistance in a variety of media, such as sulfuric, phosphoric, nitric and organic acids, alkali metals such as Sodium hydroxide, potassium hydroxide and hydrochloric acid solution. [0003] With the development of my country's national economy, the demand for petroleum products is increasing day by day, and the number of domestically processed and imported high-sulfur crude oil is also increasing year by year. Operation, the selection of materials for the high-press...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21K1/14
CPCB21K1/14
Inventor 方轶张健罗通伟谢元林余多贤粟硕韩福陈杰魏育军苏超
Owner PANGANG GROUP JIANGYOU CHANGCHENG SPECIAL STEEL